TWI418858B - Color filter substrate and color display apparatus - Google Patents

Description

Color filter substrate and color display device

The present invention relates to a color display device, and more particularly to a color filter substrate and a color display device having the color filter substrate.

With the advancement of flat display technology and the advantages of flat display devices such as light weight, small size, and power saving, flat display devices have become more and more popular. Common flat display devices include a liquid crystal display apparatus, a plasma display apparatus, an organic light emitting diode display apparatus, and an electrophoretic display apparatus. Etc., wherein the electrophoretic display device has the advantage of saving power compared to other flat display devices because the electrophoretic display device does not require a light source.

The conventional electrophoretic display device is a black-and-white display device, but in order to make the electrophoretic display device more competitive in the market, the conventional technology uses a color filter substrate to colorize the electrophoretic display device, so that The electrophoretic display device conforms to the current trend of colorization of flat display devices.

1 is a schematic cross-sectional view of a conventional electrophoretic display device. Referring to FIG. 1 , the conventional electrophoretic display device 300 includes a lower substrate 310 , a front plane laminate (FPL) 320 and a color filter substrate 330 . The lower substrate 310 has a driving circuit layer 312, and the front plate 320 is disposed on the driving circuit layer 312, and the color filter substrate 330 is disposed on the front plate 320. In addition, the driving circuit layer 312 includes a plurality of pixel electrodes (not shown), and the front plate 320 includes an electrophoretic layer 322 and a transparent electrode layer 324 disposed on the electrophoretic layer 322. The electrophoretic layer 322 includes a plurality of black charged particles 323b and a plurality of white charged particles 323w, and the black charged particles 323b are different in electrical properties from the white charged particles 323w. By changing the electric field between the pixel electrode and the transparent electrode layer 324, the white charged particles 323w and the black charged particles 323b in the electrophoretic layer 322 can be driven to move in different directions, so that the pixels of the electrophoretic display device 300 can be displayed. different color.

In addition, the color filter substrate 330 includes a plurality of red photoresists 332r, a plurality of green photoresists 332g, and a plurality of blue photoresists 332b, and the photoresists 332r, 332b, and 332g are separated by a black matrix 334. Separated. The red photoresist 332r, the green photoresist 332g and the blue photoresist 332b are used to filter white light into red light, green light and blue light, respectively, so that the electrophoretic display device 300 can display a color image.

Although the color filter substrate 330 is disposed on the front panel 320 to enable the electrophoretic display device 300 to display a color image, since the front panel 320 and the color filter substrate 330 are both rigid substrates, the front panel 320 is When the color filter substrate 330 is attached, the generation of bubbles is likely to occur. The presence of air bubbles will result in a gap between the front plate 320 and the color filter substrate 330, which cannot be flattened. As such, the display quality of the conventional electrophoretic display device 300 will be lowered, and even the production yield of the conventional electrophoretic display device 300 will be lowered.

In addition, in the prior art, although a process such as vacuum defoaming can be used to eliminate bubbles existing between the color filter substrate 330 and the front plate 320, this increases the processing time and production cost of the entire electrophoretic display device 300.

The invention provides a color filter substrate to prevent air bubbles from being generated between the color filter substrate and the display layer.

The invention further provides a color display device for improving the quality of the color display device and effectively improving the production efficiency.

To achieve the above advantages, the present invention provides a color filter substrate comprising a transparent substrate, a color photoresist layer and an exhaust layer. The color photoresist layer is disposed on the transparent substrate. The vent layer is disposed on the transparent substrate and surrounds the color photoresist layer. The venting layer includes a plurality of strip patterns arranged at intervals, and one end of each strip pattern is connected to the color photoresist layer, and the other end of each strip pattern extends away from the color resist layer, wherein any two adjacent strips An air guiding groove is formed between the patterns. This air guide is used to vent to prevent air bubbles.

In an embodiment of the invention, the color photoresist layer has a first side, a second side connected to the first side, a third side opposite the first side, and a fourth side opposite the second side. The strip patterns of the vent layer are respectively connected to the first side, the second side, the third side, and the fourth side of the color photoresist layer. The strip patterns connecting the first sides extend in the same direction, the strip patterns connecting the second sides extend in the same direction, the strip patterns connecting the third sides extend in the same direction, and the extending direction of the strip patterns connecting the fourth sides the same.

In an embodiment of the invention, the strip pattern connecting the first sides has the same extending direction as the strip pattern connecting the third sides, and is perpendicular to the first side and the third side, respectively. The strip pattern connecting the second sides extends in the same direction as the strip pattern connecting the fourth sides, and is perpendicular to the second side and the fourth side, respectively.

In an embodiment of the invention, the thickness of the color photoresist layer is equal to or smaller than the thickness of the vent layer.

In an embodiment of the invention, the material of the exhaust layer is a transparent photoresist material or a color photoresist material.

In an embodiment of the invention, the width of each of the air guiding grooves is equal to the width of each color filter pattern of the color photoresist layer.

In an embodiment of the invention, the color filter substrate further includes a black matrix layer disposed on the transparent substrate and separating the plurality of color filter patterns of the color photoresist layer.

In an embodiment of the invention, the transparent substrate is made of glass, polymide (PI), polyethylene terephthalate (PET), polyethylene naphthalate ( Polyethylene naphthalate (PEN), polymethyl methacrylate (PMMA) or polycarbonate (PC).

In order to achieve the above advantages, the present invention further provides a color display device comprising a bottom plate, a display layer and a color filter substrate as described above. The display layer is disposed on the bottom plate. The color filter substrate is disposed on the display layer.

In an embodiment of the invention, each of the strip patterns extends from within the boundary of the display layer to outside the boundaries of the display layer.

In an embodiment of the invention, the bottom plate is made of glass, plastic or stainless steel.

In an embodiment of the invention, the display layer is a microcapsule electrophoretic display layer, a microcup electrophoretic display layer, a liquid crystal display layer, a powder moving display layer, a microelectromechanical display layer, an electrowetting display layer, An active matrix organic light emitting diode (AMOLED) display layer or a cholesteric liquid crystal display layer.

In an embodiment of the invention, the color display device is an active matrix drive display device or a passive matrix drive display device.

The color filter substrate of the present invention is provided with a vent layer surrounding the color photoresist layer on the transparent substrate, and an air guiding groove is formed between any two adjacent strip patterns in the vent layer. Thus, when the color filter substrate is attached to the display layer, the bubbles can be discharged along the air guide groove to prevent air bubbles from being generated between the color filter substrate and the display layer. In addition, since the color filter substrate of the color display device of the present invention is less likely to have air bubbles between the display layer and the display layer, it is advantageous to improve the display quality and the production yield of the color display device, thereby reducing the production cost of the color display device.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

2 is a top plan view of a color filter substrate according to an embodiment of the present invention, and FIG. 3 is a cross-sectional view taken along line II-II of FIG. Referring to FIG. 2 and FIG. 3 , the color filter substrate 100 of the embodiment includes a transparent substrate 110 , a color photoresist layer 120 , and an exhaust layer 130 . The color photoresist layer 120 is disposed on the transparent substrate 110 , and the exhaust layer 130 is disposed on the transparent substrate 110 and surrounds the color photoresist layer 120 .

In the color filter substrate 100 described above, the material of the transparent substrate 110 may be glass, polyimide, polyethylene terephthalate, polyethylene naphthalate, polymethyl methacrylate or polycarbonate. Transparent material such as ester.

In this embodiment, the color photoresist layer 120 has, for example, a first side 121, a second side 122 connected to the first side 121, a third side 123 opposite to the first side 121, and a second side opposite to the second side 122. Four sides 124. The color photoresist layer 120 includes a plurality of color filter patterns 125. The color filter patterns 125 may include a plurality of colors, such as red, green, and blue, but are not limited thereto. Further, the arrangement of the colors of the color filter pattern 125 is not limited to that shown in FIG. 2. In addition, the color filter substrate 100 further includes a black matrix layer (not shown) disposed on the transparent substrate 110 and configured to separate the color filter patterns 125 of the color photoresist layer 120. The color photoresist layer 120 can be formed by using a technique commonly used in the art, that is, a photoresist of different colors is sequentially formed on the transparent substrate 110 by a process such as coating, exposure, development, and hard baking. However, this embodiment does not limit the method of fabricating the color photoresist layer 120.

The vent layer 130 includes a plurality of strip patterns 132 spaced apart from each other, and one end of each strip pattern 132 is connected to the color photoresist layer 120, each strip pattern The other end of the case 132 extends away from the colored photoresist layer 120. Wherein, an air guiding groove 134 is formed between any two adjacent strip patterns 132. In addition, the width D1 of each air guiding groove 134 is equal to the width D2 of each color filter pattern 125 of the color photoresist layer 120. In addition, the thickness of the color photoresist layer 120 may be equal to or smaller than the thickness of the vent layer 130.

The material of the vent layer 130 may be a transparent photoresist material (for example, PMMA, acrylic resin, etc.) or a color photoresist material. Therefore, the manufacturing method of the vent layer 130 can also be formed on the transparent substrate 110 by a process commonly used in the art, that is, the photoresist is coated, exposed, developed, hard baked, and the like. However, the present embodiment does not limit the method of fabricating the vent layer 130.

In this embodiment, the plurality of strip patterns 132 of the vent layer 130 are respectively connected to the first side 121, the second side 122, the third side 123, and the fourth side 124 of the color photoresist layer 120, for example. Moreover, the plurality of strip patterns 132 connecting the first sides 121 extend in the same direction. The plurality of strip patterns 132 connecting the second sides 122 extend in the same direction. The plurality of strip patterns 132 connecting the third sides 123 extend in the same direction. The plurality of strip patterns 132 connecting the fourth sides 124 extend in the same direction. In addition, the extending direction of the plurality of strip patterns 132 connecting the first sides 121 is the same as the extending direction of the plurality of strip patterns 132 connecting the third sides 123, and is perpendicular to the first side 121 and the third side 123, respectively. The plurality of strip patterns 132 connecting the second sides 122 extend in the same direction as the plurality of strip patterns 132 connecting the fourth sides 124, and are perpendicular to the second side 122 and the fourth side 124, respectively.

Of course, it can be understood that the extending direction of the strip pattern 132 is not limited to the embodiment, as long as one end of each strip pattern 132 is connected to the color photoresist layer 120, and the other end of each strip pattern 132 is away from each other. The direction of the color resist layer 120 may be extended. For example, the extending direction of the strip pattern 132 connecting the first sides 121 may also be different, and is also different from the strip connecting the third side 123. The direction in which the pattern 132 extends. The extending direction of the strip patterns 132 connecting the second sides 122 may also be different, and is also different from the extending direction of the strip patterns 132 connecting the fourth sides 124, etc., which are not enumerated here.

The color filter substrate 100 is typically disposed on a display layer of the display device to enable the display device to display a color image. The application of the color filter substrate 100 will be described below by taking a color display device as an example. 4 is a cross-sectional view showing a color display device according to an embodiment of the present invention. Referring to FIG. 2 and FIG. 4 together, the color display device 200 of the present embodiment includes a bottom plate 210, a display layer 220, and the color filter substrate 100 described above. The display layer 220 is disposed on the bottom plate 210. The color filter substrate 100 is disposed on the display layer 210.

The material of the bottom plate 210 may be glass, plastic or stainless steel, but not limited thereto. The plastic may be polyimine, polyethylene terephthalate, polyethylene naphthalate, polymethyl methacrylate or polycarbonate. The material of the bottom plate 210 can also be made of other metal alloy materials.

The display layer 220 is disposed on the bottom plate 210. The display layer 220 may be a microcapsule electrophoretic display layer, a microcup electrophoretic display layer, a liquid crystal display layer, a powder moving display layer, a microelectromechanical display layer, an electrowetting display layer, an active matrix organic light emission, depending on the type of the color display device 200. A diode display layer or a cholesteric liquid crystal display layer. In an embodiment where the display layer 220 is a microcapsule electrophoretic display layer, the display layer 220 is, for example, a front plane laminate (FPL). Further, depending on the driving method, the color display device 200 may be an active matrix driving display device or a passive matrix driving display device.

The color filter substrate 100 is disposed on the display layer 220. The color photoresist layer 120 and the exhaust layer 130 of the color filter substrate 100 are bonded to the display layer 220. Moreover, each strip pattern 132 of the vent layer 130 extends from within the boundary of the display layer 220 to outside the boundaries of the display layer 220. Therefore, the color filter substrate will be When the display layer 220 is attached to the display layer 220, air bubbles formed between the color filter substrate 100 and the display layer 220 can be easily discharged along the air guiding groove 134 of the exhaust layer 130 to prevent the presence of air bubbles in the color filter substrate 100 and the display. Between layers 220. Thus, the display quality of the color display device 200 can be improved, and the production yield of the color display device 200 can be improved. In addition, since no air bubbles are generated between the display layer 220 of the color display device 200 and the color filter substrate 100, an additional process is not required to eliminate air bubbles, so that the production efficiency of the color display device 200 can be effectively improved, thereby reducing the color display. The production cost of the device 200.

While the present invention has been described in its preferred embodiments, the present invention is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application.

100‧‧‧Color filter substrate

110‧‧‧Transparent substrate

120‧‧‧Color photoresist layer

121‧‧‧ first side

122‧‧‧ second side

123‧‧‧ third side

124‧‧‧ fourth side

125‧‧‧Color filter pattern

130‧‧‧Exhaust layer

132‧‧‧ strip pattern

134‧‧‧air guide

200‧‧‧Color display device

210‧‧‧floor

220‧‧‧ display layer

300‧‧‧electrophoretic display device

310‧‧‧lower substrate

312‧‧‧Drive circuit layer

320‧‧‧front board

322‧‧‧electrophoretic layer

323b‧‧‧Black charged particles

323w‧‧‧White charged particles

324‧‧‧Transparent electrode layer

330‧‧‧Color filter substrate

332r‧‧‧Red photoresist

332g‧‧‧Green photoresist

332b‧‧‧Blue photoresist

334‧‧‧Black matrix

D1‧‧‧ width of air guide groove

D2‧‧‧Color filter pattern width

FIG. 1 is a schematic cross-sectional view showing a conventional electrophoretic display device.

2 is a top plan view of a color filter substrate according to an embodiment of the invention.

3 is a cross-sectional view of the color filter substrate shown in FIG. 2 taken along line II-II.

4 is a cross-sectional view showing a color display device according to an embodiment of the present invention.

100. . . Color filter substrate

110. . . Transparent substrate

120. . . Color photoresist layer

121. . . First side

122. . . Second side

123. . . Third side

124. . . Fourth side

125. . . Color filter pattern

130. . . Exhaust layer

132. . . Strip pattern

134. . . Air guide

D1. . . Width of the air guide groove

D2. . . Width of color filter pattern

Claims (18)

A color filter substrate comprising: a transparent substrate; a color photoresist layer disposed on the transparent substrate; and a vent layer disposed on the transparent substrate and surrounding the color photoresist layer, the vent layer a plurality of strip patterns arranged at intervals, and one end of each strip pattern is connected to the color photoresist layer, and the other end of each strip pattern extends away from the color resist layer, wherein any two adjacent strips An air guiding groove is formed between the patterns, and the air guiding groove is used for exhausting to prevent air bubbles. The color filter substrate of claim 1, wherein the color photoresist layer has a first side, a second side connected to the first side, a third side opposite the first side, and a second The strips of the venting layer are respectively connected to the first side, the second side, the third side, and the fourth side of the color photoresist layer, and the first side is connected The strip patterns of the sides extend in the same direction, the strip patterns connecting the second sides extend in the same direction, and the strip patterns connecting the third sides extend in the same direction, and the fourth side is connected The strip patterns extend in the same direction. The color filter substrate of claim 2, wherein the strip patterns connecting the first sides extend in the same direction as the strip patterns connecting the third sides, and are respectively perpendicular In the first side and the third side, the strip patterns connecting the second sides extend in the same direction as the strip patterns connecting the fourth sides, and are perpendicular to the second side, respectively. With the fourth side. The color filter substrate of claim 1, wherein the color photoresist layer has a thickness equal to or smaller than a thickness of the vent layer. The color filter substrate of claim 1, wherein the material of the vent layer is a transparent photoresist material or a color photoresist material. The color filter substrate of claim 1, wherein each of The width of an air guiding groove is equal to the width of each color filter pattern of the color photoresist layer. The color filter substrate of claim 1, further comprising a black matrix layer disposed on the transparent substrate and separating the plurality of color filter patterns of the color photoresist layer. The color filter substrate of claim 1, wherein the transparent substrate is made of glass, polyimide, polyethylene terephthalate, polyethylene naphthalate, polymethyl Methyl acrylate or polycarbonate. A color display device includes: a bottom plate; a display layer disposed on the bottom plate; and a color filter substrate disposed on the display layer, the color filter substrate comprising: a transparent substrate; a color photoresist layer And disposed on the transparent substrate; and a venting layer disposed on the transparent substrate and surrounding the color photoresist layer, the venting layer includes a plurality of strip patterns arranged at intervals, and one end of each strip pattern The color photoresist layers are connected, and the other end of each strip pattern extends away from the color photoresist layer, and an air guiding groove is formed between any two adjacent strip patterns, and the air guiding channel is used for exhausting To prevent air bubbles. The color display device of claim 9, wherein each strip pattern extends from a boundary of the display layer to outside a boundary of the display layer. The color display device of claim 9, wherein the color photoresist layer has a first side, a second side connected to the first side, a third side opposite the first side, and a second side On the fourth side, the strip patterns of the vent layer are respectively connected to the first side, the second side, and the first side of the color photoresist layer The three sides and the fourth side, the strip patterns connecting the first sides extend in the same direction, and the strip patterns connecting the second sides extend in the same direction, and the strips connecting the third sides are The pattern extends in the same direction, and the strip patterns connecting the fourth sides extend in the same direction. The color display device of claim 11, wherein the strip patterns connecting the first sides extend in the same direction as the strip patterns connecting the third sides, and are perpendicular to The first side and the third side, the strip patterns connecting the second sides extend in the same direction as the strip patterns connecting the fourth sides, and are perpendicular to the second side respectively The fourth side. The color display device of claim 9, wherein the color photoresist layer has a thickness equal to or smaller than a thickness of the vent layer. The color display device of claim 9, wherein the material of the vent layer is a transparent photoresist material or a color photoresist material. The color display device of claim 9, wherein the width of each of the air guiding grooves is equal to the width of each color filter pattern of the color photoresist layer. The color display device of claim 9, wherein the bottom plate is made of glass, plastic or stainless steel. The color display device according to claim 9, wherein the display layer is a microcapsule electrophoretic display layer, a microcup electrophoretic display layer, a liquid crystal display layer, a powder moving display layer, a microelectromechanical display layer, and an electrowetting display. Layer, active matrix organic light emitting diode display layer or cholesteric liquid crystal display layer. The color display device of claim 9, wherein the color display device is an active matrix drive display device or a passive matrix drive display device.